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(No Model.)

E. 0. AT INS.- APPARATUS FOR POLISHING SAW BLADES BY SAND BLAST.

Patented Nov. 29, 18181.

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UNITED- STATES PATE T OFFICE.

ELIAs o. 'ATKINs, or INDIANAPOLIS, INDIANA.

APPARATUS FOR POLISHING SAW-BLADES BY SAND-BLAST.

SPECIFICATION formingpart of Letters Patent No. 250,185, dated November 29, 1881. Application filed April 28, 1881. (No model.)

To all whom it may concern.

Be it known that I, ELIAS C. ATKINS, a citizen of the United States, residing at Indianapolis, in the county of Marion and State of Indiana, have invented a new and useful Apparatus for Polishing Saw-Blades by Sand- Blasts, of which the following is a specification.

My invention relates to improvements in sand-blast machines for polishing saw-blades, in which the saw-blade is moved backward and forward between rollers, and the side surfaces of the blade subjected to the abrasive action of sand-blasts above and below; and the objects of my invention are, first, to provide a sandblast apparatus with suitable mechanism for moving a saw-blade backward and forward under the action of a single blast of sand, or between two or more blasts of sand; second, to afford facilities for giving the forward and backward moving saw-blade a lateral motion; third, to provide suitable means for protecting the forward feed-rollers from the action of the sand-blast, both above and below; fourth, to provide a means for revolving all the feed rollers simultaneously for moving the sawblade backward or forward during the act of polishing. These objects I accomplish by the mechanism illustrated in the accompanying drawings, in which- Figure 1 represents a top view of the entire machine. same, and Fig. 3 is an end elevation.

Similar letters throughout the several views refer to like parts.

A represents the bed, on which are mounted the four corner-posts B B B B. The cornerposts at each end of the machine are united together by the lower cross-bars, G O, and upper bars, G 0. Between the bars 0 and G,

"at each end of the frame, is another movable frame, composed of the upper rectangular half, D D D D, and the lower half, D D D D, which are united together at each corner by the standards R B. This frame has a lateral movement between the bars 0 and O, and may be operated by the crank-shaft L, cranks g and g, and connecting-rods t 2', said connectingrods having one end attached to said cranks and their other ends made fast to the lower frame, D, as shown in Fig. 1. The crankshaftLis supported in suitable boxes, ff, made Fig. 2 is a side elevation of the fast to the corner-posts B B, as shown in Fig. 2. The crank-shaft L has another crank, 9 to which one end of the connecting-rod i is attached. The other end of said rod is made fast to the lower sand-blast nozzle, 1, the use of which will be hereinafter described.

The movable frame D D is provided with a pair of rollers, E E, near one end, and a pair of rollers, F F, near the other end. Each pair of these rollers is designed to act as feed-rollers to carry the saw-blade K backward and forward between them, and each pair of rollers may be geared together at one end, or worked by friction-rollers, or by a cross belt, and the power which is applied to the lower roller, E, by means of a straight belt, a, and a twisted belt, 1), operating on the tight and loose pulleys, G, is communicated to the roller F by the belt 0, and the rollers E and F communicate motion to their respective rollers above, as before describedthat is, either by a cross belt, at, friction-rollers, or spur-gear-the last two devices not shown, but held to be equivalents of the belt d. The steam or air blast pipe N extends up above the end of the machine, and is provided with a side branch T-coupling, J, below the movable frame D D, also a T-coupling, J, above said frame. The T-coupling J below is provided with a pipe and elbows r 1", also a branch or T, 8.

To the side branch of the T s is fitted one end of a rubber or flexible pipe, H. The other end of said pipe is connected to one end branch of the T, O, and the side branch of the T, O, is connected with the sand-box P. The outer end branch of the T s is provided with the nozzle 1, which is adjusted to any required angle to throw the sand against the under side of the saw-blade K. The side branch of the upper T-coupling, J, is in like manner provided with a pipe, m, elbows r r, a T coup ling, s, and a nozzle, I, and has the flexible pipe H attached to the side branch of the T s, also to one end branch of the T, O,which is attached to the sandbox P below. Thus the sand from the sand-box P, when forced through the nozzles 1 below and I above, by the action of steam or compressed air passing through the pipe N, is driven violently against the up per and lower sides of the saw-blade K, and as the saw=blade is moved forward and back Ice ward between the rollers E E F F the faces of the saw become polished.

In order to prevent the sand from the nozzles from striking against the front rollers, E F, I introduce the bars at at between the sides of the top and bottom frames, D and D, and to each of these cross-bars I secure a strip of leather or other suitable material, 12 c, which forms inclined abutments and throws the sand off of the blade. When it is not desired to throw sand through the nozzles the plug 19 in the T-coupling O is removed. The nozzles I I being both connected with the pipe N, and the lower nozzle, 1, connected to the crank g of the crank-shaft L by the rod 1 it is obvious that as the crank-shaft L is revolved the nozzles have also imparted to them a lateral motion, which causes the sand discharged to spread over a large surface of the saw-blade during the act of polishing.

What I claim as new, and desire to secure by Letters Patent, is

1. In a sand-blast apparatus for polishing saws, the frame D D, with feed-rollers E E near one end and rollers F F near the other end, with means for revolving the upper and lower rollers in opposite directions, adapted to move a saw-blade,K, forward and backward between two sand-blast nozzles, I I, substantially as shown and described.

2. The frame D D, with feed-rollers E E near one end and rollers F F near the other end, with means for revolving the upper and lower rollers in opposite directions, combined with the bars at n and flexible sand-guards v 01, substantially as shown and described.

3. In combination with the frame D D, having feed-rollers E E and F F, with means for revolving the upper and lower rollers in opposite directions, conuecting-rodst' 'i and cranks g g of the crank-shaft L, substantially as shown and described.

4. In a sand-blast apparatus for polishing saw-blades, a frame provided with feed-rollers, with means for revolving the upper and lower rollers in opposite directions, adapted to move the saw-blade forward and backward while a saw-blade is being subjected to a sand-blast, substantially as shown and described.

In testimony whereofI have signed my name to this specification in the presence of two subscribing witnesses.

. ELIAS O. ATKINS. Witnesses:

G. H. BENNETT, E. O. FRINK. 

